Rode
ICLAMP

Support clamp for i-XY (30-pin) and iPhone 4/4S

In fact, skip down to the video tab, and you can see just how impressed we were at the time of release!

Anyway, this handy accessory - iClamp - is a heavy-duty clamp designed to provide additional support for your i-XY stereo microphone (30-pin version) during high movement usage with an iPhone 4 or iPhone 4S.